@misc{RaziVarlamovaReifetal., author = {Razi, Sepehr and Varlamova, Olga and Reif, J{\"u}rgen and Bestehorn, Michael and Varlamov, Sergej and Mollabashi, Mahmoud and Madanipour, Khosro and Ratzke, Markus}, title = {Birth of periodic Micro/Nano structures on 316L stainless steel surface following femtosecond laser irradiation; single and multi scanning study}, series = {Optics \& Laser Technology}, volume = {104}, journal = {Optics \& Laser Technology}, issn = {0030-3992}, doi = {10.1016/j.optlastec.2018.02.001}, pages = {8 -- 16}, abstract = {Formation of coherent laser induced periodic surface structures (LIPSS) on stainless steel type 316L by 100 fs laser pulses at 800 nm wavelength is investigated. Specifically focusing on the large area treatment, effect of the irradiation dose (fluence × pulse number) on the uniformity of the morphology, orientation of the ripples respect to the laser polarization and their periodicity is studied systematically. Controlling the pulse number via varying the scanning speed, the difference between irradiating one particular dose in single scan with its irradiation in separate steps is inspected. Results clearly point out that not only the irradiation dose but also the irradiation way and the time delay between the pulse trains might have a significant effect on the final outcomes. It is discussed in detail that the experimental observations are supporting the model of self-organized structure formation due to irradiation induced instability.}, language = {en} } @misc{BorciaBorciaBestehornetal., author = {Borcia, Rodica and Borcia, Ion-Dan and Bestehorn, Michael and Varlamova, Olga and Hoefner, Kevin and Reif, J{\"u}rgen}, title = {Drop Behavior Influenced by the Correlation Length on Noisy Surfaces}, series = {Langmuir}, volume = {35}, journal = {Langmuir}, doi = {10.1021/acs.langmuir.8b03878}, pages = {928 -- 934}, language = {en} } @misc{VarlamovaHoefnerRatzkeetal., author = {Varlamova, Olga and Hoefner, Kevin and Ratzke, Markus and Reif, J{\"u}rgen and Sarker, Debasish}, title = {Modification of surface properties of solids by femtosecond LIPSS writing: comparative studies on silicon and stainless steel}, series = {Applied Physics A}, volume = {123}, journal = {Applied Physics A}, number = {12}, issn = {0947-8396}, doi = {10.1007/s00339-017-1362-y}, pages = {6}, language = {en} } @misc{CzajkowskiRatzkeVarlamovaetal., author = {Czajkowski, Klaus and Ratzke, Markus and Varlamova, Olga and Reif, J{\"u}rgen}, title = {Femtosecond-laser-induced periodic surface structures on magnetic layer targets: The roles of femtosecond-laser interaction and of magnetization}, series = {Applied Surface Science}, volume = {417}, journal = {Applied Surface Science}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2017.03.148}, pages = {84 -- 87}, language = {en} } @misc{VarlamovaReifStolzetal., author = {Varlamova, Olga and Reif, J{\"u}rgen and Stolz, Michael and Borcia, Rodica and Borcia, Ion-Dan and Bestehorn, Michael}, title = {Wetting properties of LIPSS structured silicon surfaces}, series = {The European Physical Journal B}, volume = {92}, journal = {The European Physical Journal B}, number = {5}, issn = {1434-6036}, doi = {10.1140/epjb/e2019-90672-2}, pages = {8}, abstract = {The controlled dynamics of liquid drops via generation of specific wetting states on a solid surface is of great interests both in the fundamental and applied sciences. Considering that the wettability is strongly dependent on the surface topography and surface roughness, we investigate - through experiments and theory - the effect of laser-induced periodic surface structures (LIPSS) generated on silicon (100) targets as a control parameter of wetting properties. To obtain structured silicon surfaces with different morphological features, we patterned the surface by irradiation with femtosecond pulses from an amplified Ti:Sapphire laser system (790 nm/100 fs/1 kHz) at a fluence in the range of 0.4-1.2 J/cm2 on a spot with a diameter about of 100 μm. Variation of the applied irradiation dose results in surface modifications with the roughness about of a few tens of nanometers are ranging from regular LIPSS patterns with the lateral period of about 500-700 nm to complex agglomerations of 3-D microstructures with several-μm feature size. The theoretical study on the correlation of wetting properties with the surface topography has been performed within a phase field model. We found an excellent agreement of numerical results with experiments.}, language = {en} }